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- W137321742 abstract "Many secretory proteins are degraded intracellularly rather than secreted, however the location of this catabolic process is not known. The authors have tested the hypothesis that the degradation occurs in the organelles of the secretory pathway. Slices of rat liver were incubated with (/sup 14/C)leucine for 3 h and then incubated under chase conditions for 30 min. The tissue was homogenized and the Golgi apparatus, smooth endoplasmic reticulum (sER) and rough endoplasmic reticulum (rER) were isolated by ultracentrifugation on a discontinuous sucrose gradient. The organelles were incubated in 0.3M sucrose-50 mM citrate (pH 4) for 8-12 h at 37 C; control samples were incubated at 4 C. Percent degradation was calculated as the amount of acid soluble radioactivity released relative to total radioactivity in the sample. Proteolysis in the organelles incubated at 37 C was as follows: Golgi: 15-25%; sER: 10-20%; rER: 10-20%. Proteolysis at 4 C was negligible in all cases. These results support the hypothesis that the compartments of the secretory pathway are capable of degrading newly synthesized secretory proteins." @default.
- W137321742 created "2016-06-24" @default.
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- W137321742 date "1987-05-01" @default.
- W137321742 modified "2023-09-27" @default.
- W137321742 title "Proteolysis in the secretory pathway" @default.
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